Fastener.



C. M. 6: J. E. MACKENZIE.

FASTENEH.

APPLICATION mm Novv 2:. 19m. RENEWED SEPT. I. 1918,

Patented Oct. 29, 1918.

' UNITED STATES PATENT orrroa.

GEGILIA MARGARET MACKENZIE AND JESSIE EVANGELINE HACKENZIE, 0! LONDON,

' ENGLAN D.

FASTENEB.

Specification o! Letterl Patent.

Patented Oct. 29, 1918.

Application filed November 22, 1918, Serial No. 802,527. Renewed September 7, 1818. Serial No. 958,078.

To all whom it may concern:

Be it known that we, CEoILrA MARGARET MACKENZIE, a subject of the King of Great Britain and Ireland, and residing at 35 Dover street, in the'county of London, England, and Jnssm EVANGELINE Maorrnnzm a subject of the King of Great Britain and Ireland, and residin at 35 Dover street, 1n the county of Lon on, England, have 1nvented certain new and useful Im rovements in and Relating to Fasteners, 0 which the following is a specification.

This invention relates to spring fasteners especially of the type usuallyknown as glove fasteners or press studs w ich are largely used for fastening materials or garments of many kinds.

Ordinary press stud fasteners as used in large numbers have the d1sadvantage' that when the garments to which they are applied are tight the fasteners are easily unfastened at the wrong time although the springs are suilicient to retain the fastening when the garments are loose.

Special arrangements of s rin studs have been proposed but we have oun by experiment that the have disadvantages, either they are inten ed for loose garments and become undone if subjected to much stressor they can only be applied on garments which keep them in a state of stress, becoming undone if the garments be loose or again difficulty occurs in fastening and unfastening.

According to our invention by which these difficulties are overcome we take a press stud of ordinar form with a central dome through which sprin s project tending to keep the other part c the stud in the center of the dome and drill or otherwise cut a small holethrough the dome at a place in the edge and through the base plate. We find in this way that with loose garments the improved stud acts as an ordinary stud and is used assuch, the additional hole having practically no effect; with tight garments or when stresses occur although the stud is fastened and unfastened as an ordina stud yet the hole catches the head of the other art of the stud and serves to give a secureastening.

- particular formation is given as an example Referring to the accompanying diagrammatic drawings Figure 1 is a section (on the line 1-1 of 2) of one element of a press stud, and

1g. 2 is a plan correspondin thereto.

Figs. 3 and 4 are sections on t e lines 3--3 and 4-4 of Fig. 2 respectively.

Figs. 5 and 6 show the other element in elevation and plan respectively.

The drawings which lllustrate one manner of carrying the invention into efl'ect show a press stud of well known form except that a small hole a is drilled partly through the crown d and partly through the flange e. The hole may be of different shape to that shown, it may be formed otherwise than by drilling.

In use the head I of the lower member 9 is pushed into the crown d past springs 6 exactly as with the usual fastener.

When stresses occur in the material instead of the fastener bein pulled open the head f is drawn into the ole c where it is practically unacted upon by the s rings 12 but where it becomes securely locke because the head f cannot ass through the hole which is made of su ciently small diameter and the neck h of the head engages with the edge 11 of the hole. In this way central entry of the head f is obtained and slight mot1on 1s permitted after fastening, glving a press stud which is easy to fasten and which does not become unfastened in use.

It will be quite well appreciated that this onl and may be modified.

aving now described our invention, what we claim as new and desire to secure by Letters Patent is 1. A sprin element of a spring press stud with a centre dome, spring wires extending therethrough'parallel to each other and to a diameter and situate on each side of the aforesaid diameter, the dome being perforated at its edge on the same diameter.

2. A spring element of a spring press" stud with a dome and a flange, sprin wires extending through the dome parafiel to each other and to a diameter and situate on each side of the aforesaid diameter, a small hole being cut in part at the edge of the dome on the same diameter and in part in the flange conti uous thereto.

3. spring element of a spring press stud with a central dome, a flan e and a turnedover rim, a spring wire he] in the rim, the two ends extending through the dome parallel to each other and to a diameter and situate on each side of the aforesaid diameter, and a small hole being cut in part through the edge of the dome and in part through the flange adjacent thereto 0n the same aforesaid diameter.

In testimony whereof we have signed out names to this specification in the presence 16 of twosubscribing witnesses.

GEUILIA MARGARET MACKENZIE. JESSIE EVANGELINE MACKENZIE. Witnesses to the signature of Cecilia M.

Mackenzie:

JOHN G. MACROE, G. C. SINCLAIR. Witnesses to the signature of Jessie E.

Mackenzie:

CARL R. Loor, O. J. WORTH. 

